Of optical instruments and appliances of subheading 9031.41 or 9031.49.70
Measuring or checking instruments, appliances and machines, not specified or included elsewhere in this chapter; profile projectors; parts and accessories thereof: > Parts and accessories: > Of other optical instruments and appliances, other than test benches: > Of optical instruments and appliances of subheading 9031.41 or 9031.49.70
Duty Rate (from China)
Except for products described in headings 9903.03.02–9903.03.11, articles the product of any country, as provided for in subdivision (aa) of U.S. note 2 to this subchapter
Except as provided in headings 9903.88.05, 9903.88.06, 9903.88.07, 9903.88.08, 9903.88.10, 9903.88.11, 9903.88.14, 9903.88.19, 9903.88.50, 9903.88.52, 9903.88.58, 9903.88.60, 9903.88.62, 9903.88.66, 9903.88.67, 9903.88.68, or 9903.88.69, articles the product of China, as provided for in U.S. note 20(a) to this subchapter and as provided for in the subheadings enumerated in U.S. note 20(b) [to this subchapter]
Products classified under HTS 9031.90.54.00
Laser Alignment Lens for Optical Micrometer
Precision-ground optical lens used in laser micrometers (HTS 9031.41) for focusing the laser beam to measure object dimensions with micron accuracy. This component is specifically designed as a replacement part for these optical measuring instruments. It falls under 9031.90.54.00 as a part of optical instruments in subheading 9031.41.
Profile Projector Stage Micrometer
High-precision glass slide with etched scale mounted on profile projector worktables (9031.49.70) for stage calibration and measurement verification. Essential accessory for ensuring dimensional accuracy in optical comparators. Classified under 9031.90.54.00 as a part specific to these optical inspection instruments.
Optical Micrometer Collimator Assembly
Adjustable collimator tube assembly for non-contact optical micrometers (9031.41) that aligns the laser beam path for accurate distance measurement. Contains precision optics and mounting hardware specific to these gauging instruments. Falls under 9031.90.54.00 as a dedicated part for listed subheadings.
Optical Micrometer Cooling Heatsink Assembly
Extruded aluminum heatsink with integral fan mount for thermal management of high-power laser micrometer detectors (9031.41). Maintains optical stability during continuous measurement. Thermal part of 9031.90.54.00.
Profile Projector LED Illuminator Module
High-intensity LED ring light module for profile projectors (9031.49.70) providing uniform edge illumination for silhouette measurement. Designed with specific heat sinking and optics integration for these optical comparators. Classified in 9031.90.54.00 as an instrument-specific light source.
Optical Linear Scale Reader Head
Compact optical sensor head for reading glass or steel linear scales in coordinate measuring systems incorporating 9031.41 micrometers. Provides digital position feedback essential for precision measurement. Part of 9031.90.54.00 for specified optical instruments.
Laser Micrometer Beam Splitter Prism
Specialized dichroic prism that splits laser measurement and reference beams in dual-axis optical micrometers (9031.41). Ensures measurement accuracy through precise beam separation. Specific part for listed subheading classifies under 9031.90.54.00.
Profile Projector Overlay Chart Holder
Precision adjustable chart clip mechanism for holding Mylar or glass overlay templates on profile projector screens (9031.49.70). Enables template-based dimensional inspection. Mechanical accessory specific to these optical instruments under 9031.90.54.00.
Optical Micrometer Signal Processor Board
Digital signal processing PCB specific to laser micrometer receivers (9031.41) that converts analog light signals to measurement data. Includes A/D converters and firmware optimized for gauging applications. Electronic part under 9031.90.54.00.
Profile Projector Telecentric Lens Adapter
Mounting adapter ring enabling telecentric lens attachment to profile projector optical tubes (9031.49.70) for distortion-free edge measurement. Precision machined with specific thread patterns. Optical-mechanical part of 9031.90.54.00.
Laser Gauge Dust Shield Window
Sapphire or fused silica protective window for laser micrometer optical heads (9031.41) preventing contamination while maintaining beam transmission. Anti-reflective coated for measurement accuracy. Classified as protective part under 9031.90.54.00.
Optical Comparator Screen Reticle
Precision etched glass reticle mounted in profile projector eyepieces (9031.49.70) providing measurement reference lines and scales. Calibrates angular and linear measurements. Part specific to these instruments under 9031.90.54.00.
Laser Micrometer Focus Adjustment Mechanism
Micrometer screw and kinematic mount assembly for fine focus adjustment of laser beam in optical gauging heads (9031.41). Provides sub-micron positioning repeatability. Mechanical precision part of 9031.90.54.00.
Profile Projector Worktable Air Bearing
Porous carbon air bearing pad for frictionless movement of workpieces on profile projector measuring stages (9031.49.70). Enables ultra-precise positioning for optical inspection. Specialized bearing under 9031.90.54.00.
Profile Projector Objective Turret
Rotating turret assembly holding multiple magnification objectives for profile projectors (9031.49.70). Quick-change mechanism indexes precise optics for different measurement ranges. Core optical-mechanical part under 9031.90.54.00.